Insulator for trolley-wires.



B. C. MOSS.

INSULATOR FOR TROLLEY WIRES.

APPLICATION FILED JAN. 11. 1915.

1 1 85,700. Patented June 6, 1916.

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UNITED sTATEs PATENT OFFICE.

BENTON C. MOSS, OF KANSAS CITY, MISSOURI, ASSIGNOR OF ONE-HALF T0CHARLES C. FRITTS, OF KANSAS CITY, MISSOURI.

INSULATOR FOR TROLLEY-WIRES.

Application filed January 11, 1915.

To all 'w ham it may concern Be it known that I, BENTON C. Moss, acitizen of the United States, residing at Kansas City, in the county ofJackson and State of Missouri, have invented certain new and usefulImprovements in Insulators for Trolley-Vires, of which the following isa specification.

This invention relates to insulators for trolley lines and has for itsobject to produce an insulator which is of universal application in thesense that it can be used at all the important points in trolley lineswhere heretofore several different insulators have been employed.

I Vith this object in view the invention consists essentially in theprovision of a rounded insulator provided with a peripheral groove, acentral passage extending at right angles to the groove, and shouldersat opposite ends of the passage,-the shoulders being preferably producedby grooving opposite faces of the insulator, and in order that theinvention may be fully understood reference is to be had to theaccompanying drawing, in which Figure 1, is a plan view of an insulatorembodying my invention, for connecting a span wire with a trolley wiresupporting ear of well known construction. Fig. 2 is a section on theline IIII of Fig. 1.. Fig. 3, is a horizontal section of a trolley pole,and shows one of my improved insulators utilized as a means forconnecting a collar on said pole to the outer end of a span forsupporting a trolley line. Fig. 4, is a side elevation of the same. Fig.5, is an elevation showing the use of a plurality of my improvedinsulators in the span wire for a high tension system trolley wire. Fig.6, is a view of the same taken at right angles to the view shown by Fig.5.

In the said drawing, 1 indicates an insulator of porcelain or othersuitable nonconducting material. In the preferred construction, thisinsulator is of elliptic form and is provided in its curved surface oredge with a circumferential groove 2. It is also provided with a centralpassage 3 extending in a plane at right angles to the plane of thecircumferential groove and at its ends in the plane of the flattenedparallel faces 4 which faces are preferably produced by providing theinsulator with straight grooves extending clear across the insuiSpecification of Letters Patent.

Patented June 6, 1916.

Serial No. 13633.

lator as shown clearly, the said grooves being wider than the passage 3,and forming shoulder 55 for a purpose which hereinafter appears. \Vherethe insulator is of elliptic form which is the preferred type, thegrooves extend longitudinally.

In Fig. 1, the span wire (3 is bowed at 7 and fits in thecircumferential groove and to secure it reliably to the insulator anoppositely bowed tie bar 8 engages the circumferential groove at theopposite side from the bowed portion of the span Wire and terminates inhooks 9 engaging the span wire and clamping the insulator firmly inplace.

10 is the customary ear for the support of the trolley wire 11, the earhaving an upwardly projecting central boss 12 provided with the usualthreaded socket 13 shown in dotted lines and adapted for engagement bythe bolt 14- extending loosely through the passage 3 of the insulatorand adapted to clamp the latter upon the upper end of the boss. To guardagainst accidental unscrew ing of the bolt, a locking device such as aspring washer 15 is interposed between the head of the bolt and theinsulator, it being noted that the boss and the locking device areseated upon the flat faces 4 of the insulater, which faces aresufficiently wide to accommodate said parts. The washer is incapable ofturning completely around because it is provided with a spur 16 adaptedto engage one of said shoulders i. or the other. The looseness withwhich the bolt extends through the insulator is to accommodate thegreater expansive property of the bolt so that there shall be no dangerof the expansion of the latter resulting in the cracking or breaking ofthe insulator.

Figs. 3 and 4:, illustrate the insulator used as a connection betweenone of the ends of the span wire and a trolley pole 17. In thisconstruction the span wire encircles the insulator by fitting in thegroove thereof and is secured reliably by twisting adjacent or doubledportions of the wire together, though of course any other means may beemployed for securing the ends of the wires. 18 indicates a common formof collar mounted upon the trolley pole and terminating in parallel arms19 fitting in the grooves of the insulator, and to secure the latterreliably in place, a bolt 20 extends through its passage 3 and said arms19 and is engaged by a retaining nut 21. In Figs. 5 and 6, the span wireis shown in sections each bein secured to one of a pair of insulators inthe manner shown in Figs. 3 and l, and to connect the pair ofinsulators, parallel bars 22:. extend through the alined grooves in thecorresponding faces of the insulators and are secured to the latter bybolts and nuts 21 as in Figs. 3 and 1-. The insulator can also be usedwith the single pullover span wires, s .ch as employed when the trolleywire turns corners or is otherwise deflected from a straightcourse. Inthis case the span wire may be attached. to the insulator as shown byFig. 3, the short trolley wire ear necessary to accommodate thecurvature of the trolley wire being attached to the insulator as shownby Figs. 1 and 2.

In all the uses of the insulator, the elliptic form for the same ispreferred, because an insulator of that form has no tendency to rotateunder the pull or tension of the span wire.

From the foregoing it will be apparent that I have produced an insulatorwhich can be employed in any connect-ion relating to spirit and scope ofthe appended claims, and do not desire to be restricted to the exactconstruction, proportion or arrangement of parts shown.

I claim:

1. An insulator of elliptic contour in plan view, provided at its upperand lower sides with channels extending through its major axis, thebottoms of said channels being Hat and parallel; said insulator having acentral through-passage opening at its ends in said channels, and acircumferential groove intermediate its upper and lower sides.

:2. An insulator of elliptic contour in plan view, provided at its upperand lower sides with channels extending through its major axis, thebottoms of said channels being flat and parallel, said insulator havinga central through-passage opening at its ends in said channels, and acircumferential groove intermediate its upper and lower sides, in combination with supporting means, comprising parallel parts fitting insaid channels and a bolt extending through said parts and the saidpassage and securing the insulator nonrotatably to said parts.

In testimony whereof, I afiix my signature, in the presence of twowitnesses.

BENTON C. MOSS. \Vitnesses H. C. RODGERS, G. Y. THORPE.

Copies of this patent may be obtained tor five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

